1. locate command
Search by filename
Searches are fast, but not suitable for precise lookups. Generally not.
2. find command
1. find [scope ] [condition ] [filename ]
/ is the search scope, the root directory. Narrow the scope /root/ table root directory, etc.
-name is by name
Can't find it because it's not a fuzzy query. The file name should be specified
2. If you want fuzzy query, add wildcard
Wildcard: *
All files starting with algorithm are found
3. Wildcards?
One? Indicates that there is one character after the search algorithm
two? Indicates that there are two characters after the search algorithm
4. Wildcards * and ? Can be added anywhere in the keyword algorithm
5. Wildcard [ ]
Indicates that any character within [ ] can be found
6. Linux is case-sensitive. If the file name is lowercase, if the search is written in uppercase, it will not be found.
If it is not case sensitive just add an i before the name
7. The first few sections are based on the file name-name search, and can also be based on the user - user
Find all files in the root user directory
8. -size Find according to the file size
命令 [root@localhost ~]# find /root/ -size 2k
2k means 1~2k
1k means 0~1k
+2k means greater than 2k
-2k means less than 2k
命令 [root@localhost ~]# find /root/ -size +10k –a –size -20k
Indicates to find files greater than 10k and less than 20k in the root directory
-a means and with
-o means or or
9. -inum Find according to the i node
[root@localhost ~]# ll –I show all i-node files
10. Search by time
-atime +n means files with access or execution time greater than n days
-ctime +n means write files with a change time greater than n days
-mtime +n means that files whose writing time is greater than n days are used the most
-n means less than n days
3. grep command
Grep [string to look for ] [path ]
Find strings in configuration files in a directory
Options
-i ignore case
[root@localhost ~]# grep -i save /etc/grub2.cfg
-v exclude the specified string
[root@localhost ~]# grep -v save /etc/grub2.cfg
Fourth, the command search command whereis and which
1. whereis find files
whereis [options ] [filename ]
Option –b table finds only binary executables
-m table finds only help files (files in the man directory)
-s table finds only source code files
2, which finds the absolute path of the executable file
which [executable filename ]
